$(function() {

    //remove js-disabled class
    $("#viewer").removeClass("js-disabled");

    //create new container for images
    $("<div>").attr("id", "container").css({
        position:"absolute"
    }).width($(".wrapper").length * 170).height(170).appendTo("div#viewer");

    //add images to container
    $(".wrapper").each(function() {
        $(this).appendTo("div#container");
    });

    //work out duration of anim based on number of images (1 second for each image)
    var duration = $(".wrapper").length * 10000;

    //store speed for later (distance / time)
    var speed = (parseInt($("div#container").width()) + parseInt($("div#viewer").width())) / duration;

    //set direction
    var direction = "rtl";

    //set initial position and class based on direction
    (direction == "rtl") ? $("div#container").css("left", $("div#viewer").width()).addClass("rtl") : $("div#container").css("left", 0 - $("div#container").width()).addClass("ltr") ;

    //animator function
    var animator = function(el, time, dir) {

        //which direction to scroll
        if(dir == "rtl") {

            //add direction class
            el.removeClass("ltr").addClass("rtl");

            //animate the el
            el.animate({
                left:"-" + el.width() + "px"
            }, time, "linear", function() {

                //reset container position
                $(this).css({
                    left:$("div#imageScroller").width(), 
                    right:""
                });

                //restart animation
                animator($(this), duration, "rtl");

                //hide controls if visible
                ($("div#controls").length > 0) ? $("div#controls").slideUp("slow").remove() : null ;

            });
        } else {

            //add direction class
            el.removeClass("rtl").addClass("ltr");

            //animate the el
            el.animate({
                left:$("div#viewer").width() + "px"
            }, time, "linear", function() {

                //reset container position
                $(this).css({
                    left:0 - $("div#container").width()
                });

                //restart animation
                animator($(this), duration, "ltr");

                //hide controls if visible
                ($("div#controls").length > 0) ? $("div#controls").slideUp("slow").remove() : null ;
            });
        }
    }

    //start anim
    animator($("div#container"), duration, direction);

    //pause on mouseover
    $("a.wrapper").live("mouseover", function() {

        //stop anim
        $("div#container").stop(true);

        //show controls
        ($("div#controls").length == 0) ? $("<div>").attr("id", "controls").appendTo("div#outerContainer").css({
            opacity:0.7
        }).slideDown("slow") : null ;
        ($("a#rtl").length == 0) ? $("<a>").attr({
            id:"rtl", 
            href:"#", 
            title:"rtl"
        }).appendTo("#controls") : null ;
        ($("a#ltr").length == 0) ? $("<a>").attr({
            id:"ltr", 
            href:"#", 
            title:"ltr"
        }).appendTo("#controls") : null ;

        //variable to hold trigger element
        var title = $(this).attr("title");

        //add p if doesn't exist, update it if it does
        ($("p#title").length == 0) ? $("<p>").attr("id", "title").text(title).appendTo("div#controls") : $("p#title").text(title) ;
    });

    //restart on mouseout
    $("a.wrapper").live("mouseout", function(e) {

        //hide controls if not hovering on them
        (e.relatedTarget == null) ? null : (e.relatedTarget.id != "controls") ? $("div#controls").slideUp("slow").remove() : null ;

        //work out total travel distance
        var totalDistance = parseInt($("div#container").width()) + parseInt($("div#viewer").width());

        //work out distance left to travel
        var distanceLeft = ($("div#container").hasClass("ltr")) ? totalDistance - (parseInt($("div#container").css("left")) + parseInt($("div#container").width())) : totalDistance - (parseInt($("div#viewer").width()) - (parseInt($("div#container").css("left")))) ;

        //new duration is distance left / speed)
        var newDuration = distanceLeft / speed;

        //restart anim
        animator($("div#container"), newDuration, $("div#container").attr("class"));

    });

    //handler for ltr button
    $("#ltr").live("click", function() {

        //stop anim
        $("div#container").stop(true);

        //swap class names
        $("div#container").removeClass("rtl").addClass("ltr");

        //work out total travel distance
        var totalDistance = parseInt($("div#container").width()) + parseInt($("div#viewer").width());

        //work out remaining distance
        var distanceLeft = totalDistance - (parseInt($("div#container").css("left")) + parseInt($("div#container").width()));

        //new duration is distance left / speed)
        var newDuration = distanceLeft / speed;

        //restart anim
        animator($("div#container"), newDuration, "ltr");
    });

    //handler for rtl button
    $("#rtl").live("click", function() {

        //stop anim
        $("div#container").stop(true);

        //swap class names
        $("div#container").removeClass("ltr").addClass("rtl");

        //work out total travel distance
        var totalDistance = parseInt($("div#container").width()) + parseInt($("div#viewer").width());

        //work out remaining distance
        var distanceLeft = totalDistance - (parseInt($("div#viewer").width()) - (parseInt($("div#container").css("left"))));

        //new duration is distance left / speed)
        var newDuration = distanceLeft / speed;

        //restart anim
        animator($("div#container"), newDuration, "rtl");
    });
});